As usual, he's right. I have done a headswap on a F series. It is easy out of the car, but it would be a lot harder in the car. I spent $80 on a headgasket, and I fabricated my own intake gasket. The exhaust is reusable copper. Shitload of work for little gain. Instead, use boost, NOS, change the cam, add a header, or just buy a better engine. A F22B(jdm) or H23 would be a easy swap, and not too hard on the wallet.
That's the rizzle on the dizzle Seany-izzle.